code.delx.au - pulseaudio/blob - src/pulse/context.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <assert.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #include <unistd.h>
  32 #include <sys/stat.h>
  33 #include <errno.h>
  34 #include <signal.h>
  35 #include <limits.h>
  36
  37 #ifdef HAVE_SYS_WAIT_H
  38 #include <sys/wait.h>
  39 #endif
  40
  41 #ifdef HAVE_SYS_SOCKET_H
  42 #include <sys/socket.h>
  43 #endif
  44 #ifdef HAVE_SYS_UN_H
  45 #include <sys/un.h>
  46 #endif
  47 #ifdef HAVE_NETDB_H
  48 #include <netdb.h>
  49 #endif
  50
  51 #include "../pulsecore/winsock.h"
  52
  53 #include <pulsecore/core-error.h>
  54 #include <pulse/version.h>
  55 #include <pulse/xmalloc.h>
  56
  57 #include <pulsecore/native-common.h>
  58 #include <pulsecore/pdispatch.h>
  59 #include <pulsecore/pstream.h>
  60 #include <pulsecore/dynarray.h>
  61 #include <pulsecore/socket-client.h>
  62 #include <pulsecore/pstream-util.h>
  63 #include <pulsecore/core-util.h>
  64 #include <pulsecore/log.h>
  65 #include <pulsecore/socket-util.h>
  66 #include <pulsecore/creds.h>
  67
  68 #include "internal.h"
  69
  70 #include "client-conf.h"
  71
  72 #ifdef HAVE_X11
  73 #include "client-conf-x11.h"
  74 #endif
  75
  76 #include "context.h"
  77
  78 #define AUTOSPAWN_LOCK "autospawn.lock"
  79
  80 static const pa_pdispatch_cb_t command_table[PA_COMMAND_MAX] = {
  81     [PA_COMMAND_REQUEST] = pa_command_request,
  82     [PA_COMMAND_OVERFLOW] = pa_command_overflow_or_underflow,
  83     [PA_COMMAND_UNDERFLOW] = pa_command_overflow_or_underflow,
  84     [PA_COMMAND_PLAYBACK_STREAM_KILLED] = pa_command_stream_killed,
  85     [PA_COMMAND_RECORD_STREAM_KILLED] = pa_command_stream_killed,
  86     [PA_COMMAND_SUBSCRIBE_EVENT] = pa_command_subscribe_event
  87 };
  88
  89 static void unlock_autospawn_lock_file(pa_context *c) {
  90     assert(c);
  91
  92     if (c->autospawn_lock_fd >= 0) {
  93         char lf[PATH_MAX];
  94         pa_runtime_path(AUTOSPAWN_LOCK, lf, sizeof(lf));
  95
  96         pa_unlock_lockfile(lf, c->autospawn_lock_fd);
  97         c->autospawn_lock_fd = -1;
  98     }
  99 }
 100
 101 pa_context *pa_context_new(pa_mainloop_api *mainloop, const char *name) {
 102     pa_context *c;
 103
 104     assert(mainloop);
 105     assert(name);
 106
 107     c = pa_xnew(pa_context, 1);
 108     c->ref = 1;
 109     c->name = pa_xstrdup(name);
 110     c->mainloop = mainloop;
 111     c->client = NULL;
 112     c->pstream = NULL;
 113     c->pdispatch = NULL;
 114     c->playback_streams = pa_dynarray_new();
 115     c->record_streams = pa_dynarray_new();
 116
 117     PA_LLIST_HEAD_INIT(pa_stream, c->streams);
 118     PA_LLIST_HEAD_INIT(pa_operation, c->operations);
 119
 120     c->error = PA_OK;
 121     c->state = PA_CONTEXT_UNCONNECTED;
 122     c->ctag = 0;
 123     c->csyncid = 0;
 124
 125     c->state_callback = NULL;
 126     c->state_userdata = NULL;
 127
 128     c->subscribe_callback = NULL;
 129     c->subscribe_userdata = NULL;
 130
 131     c->memblock_stat = pa_memblock_stat_new();
 132     c->local = -1;
 133     c->server_list = NULL;
 134     c->server = NULL;
 135     c->autospawn_lock_fd = -1;
 136     memset(&c->spawn_api, 0, sizeof(c->spawn_api));
 137     c->do_autospawn = 0;
 138
 139 #ifndef MSG_NOSIGNAL
 140 #ifdef SIGPIPE
 141     pa_check_signal_is_blocked(SIGPIPE);
 142 #endif
 143 #endif
 144
 145     c->conf = pa_client_conf_new();
 146     pa_client_conf_load(c->conf, NULL);
 147 #ifdef HAVE_X11
 148     pa_client_conf_from_x11(c->conf, NULL);
 149 #endif
 150     pa_client_conf_env(c->conf);
 151
 152     return c;
 153 }
 154
 155 static void context_free(pa_context *c) {
 156     assert(c);
 157
 158     unlock_autospawn_lock_file(c);
 159
 160     while (c->operations)
 161         pa_operation_cancel(c->operations);
 162
 163     while (c->streams)
 164         pa_stream_set_state(c->streams, PA_STREAM_TERMINATED);
 165
 166     if (c->client)
 167         pa_socket_client_unref(c->client);
 168     if (c->pdispatch)
 169         pa_pdispatch_unref(c->pdispatch);
 170     if (c->pstream) {
 171         pa_pstream_close(c->pstream);
 172         pa_pstream_unref(c->pstream);
 173     }
 174
 175     if (c->record_streams)
 176         pa_dynarray_free(c->record_streams, NULL, NULL);
 177     if (c->playback_streams)
 178         pa_dynarray_free(c->playback_streams, NULL, NULL);
 179
 180     pa_memblock_stat_unref(c->memblock_stat);
 181
 182     if (c->conf)
 183         pa_client_conf_free(c->conf);
 184
 185     pa_strlist_free(c->server_list);
 186
 187     pa_xfree(c->name);
 188     pa_xfree(c->server);
 189     pa_xfree(c);
 190 }
 191
 192 pa_context* pa_context_ref(pa_context *c) {
 193     assert(c);
 194     assert(c->ref >= 1);
 195
 196     c->ref++;
 197     return c;
 198 }
 199
 200 void pa_context_unref(pa_context *c) {
 201     assert(c);
 202     assert(c->ref >= 1);
 203
 204     if (--c->ref <= 0)
 205         context_free(c);
 206 }
 207
 208 void pa_context_set_state(pa_context *c, pa_context_state_t st) {
 209     assert(c);
 210     assert(c->ref >= 1);
 211
 212     if (c->state == st)
 213         return;
 214
 215     pa_context_ref(c);
 216
 217     c->state = st;
 218     if (c->state_callback)
 219         c->state_callback(c, c->state_userdata);
 220
 221     if (st == PA_CONTEXT_FAILED || st == PA_CONTEXT_TERMINATED) {
 222         pa_stream *s;
 223
 224         s = c->streams ? pa_stream_ref(c->streams) : NULL;
 225         while (s) {
 226             pa_stream *n = s->next ? pa_stream_ref(s->next) : NULL;
 227             pa_stream_set_state(s, st == PA_CONTEXT_FAILED ? PA_STREAM_FAILED : PA_STREAM_TERMINATED);
 228             pa_stream_unref(s);
 229             s = n;
 230         }
 231
 232         if (c->pdispatch)
 233             pa_pdispatch_unref(c->pdispatch);
 234         c->pdispatch = NULL;
 235
 236         if (c->pstream) {
 237             pa_pstream_close(c->pstream);
 238             pa_pstream_unref(c->pstream);
 239         }
 240         c->pstream = NULL;
 241
 242         if (c->client)
 243             pa_socket_client_unref(c->client);
 244         c->client = NULL;
 245     }
 246
 247     pa_context_unref(c);
 248 }
 249
 250 void pa_context_fail(pa_context *c, int error) {
 251     assert(c);
 252     assert(c->ref >= 1);
 253
 254     pa_context_set_error(c, error);
 255     pa_context_set_state(c, PA_CONTEXT_FAILED);
 256 }
 257
 258 int pa_context_set_error(pa_context *c, int error) {
 259     assert(error >= 0);
 260     assert(error < PA_ERR_MAX);
 261
 262     if (c)
 263         c->error = error;
 264
 265     return error;
 266 }
 267
 268 static void pstream_die_callback(pa_pstream *p, void *userdata) {
 269     pa_context *c = userdata;
 270
 271     assert(p);
 272     assert(c);
 273
 274     pa_context_fail(c, PA_ERR_CONNECTIONTERMINATED);
 275 }
 276
 277 static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const pa_creds *creds, void *userdata) {
 278     pa_context *c = userdata;
 279
 280     assert(p);
 281     assert(packet);
 282     assert(c);
 283
 284     pa_context_ref(c);
 285
 286     if (pa_pdispatch_run(c->pdispatch, packet, creds, c) < 0)
 287         pa_context_fail(c, PA_ERR_PROTOCOL);
 288
 289     pa_context_unref(c);
 290 }
 291
 292 static void pstream_memblock_callback(pa_pstream *p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata) {
 293     pa_context *c = userdata;
 294     pa_stream *s;
 295
 296     assert(p);
 297     assert(chunk);
 298     assert(chunk->memblock);
 299     assert(chunk->length);
 300     assert(c);
 301     assert(c->ref >= 1);
 302
 303     pa_context_ref(c);
 304
 305     if ((s = pa_dynarray_get(c->record_streams, channel))) {
 306
 307         assert(seek == PA_SEEK_RELATIVE && offset == 0);
 308
 309         pa_memblockq_seek(s->record_memblockq, offset, seek);
 310         pa_memblockq_push_align(s->record_memblockq, chunk);
 311
 312         if (s->read_callback) {
 313             size_t l;
 314
 315             if ((l = pa_memblockq_get_length(s->record_memblockq)) > 0)
 316                 s->read_callback(s, l, s->read_userdata);
 317         }
 318     }
 319
 320     pa_context_unref(c);
 321 }
 322
 323 int pa_context_handle_error(pa_context *c, uint32_t command, pa_tagstruct *t) {
 324     assert(c);
 325     assert(c->ref >= 1);
 326
 327     if (command == PA_COMMAND_ERROR) {
 328         assert(t);
 329
 330         if (pa_tagstruct_getu32(t, &c->error) < 0) {
 331             pa_context_fail(c, PA_ERR_PROTOCOL);
 332             return -1;
 333
 334         }
 335     } else if (command == PA_COMMAND_TIMEOUT)
 336         c->error = PA_ERR_TIMEOUT;
 337     else {
 338         pa_context_fail(c, PA_ERR_PROTOCOL);
 339         return -1;
 340     }
 341
 342     return 0;
 343 }
 344
 345 static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
 346     pa_context *c = userdata;
 347
 348     assert(pd);
 349     assert(c);
 350     assert(c->state == PA_CONTEXT_AUTHORIZING || c->state == PA_CONTEXT_SETTING_NAME);
 351
 352     pa_context_ref(c);
 353
 354     if (command != PA_COMMAND_REPLY) {
 355
 356         if (pa_context_handle_error(c, command, t) < 0)
 357             pa_context_fail(c, PA_ERR_PROTOCOL);
 358
 359         pa_context_fail(c, c->error);
 360         goto finish;
 361     }
 362
 363     switch(c->state) {
 364         case PA_CONTEXT_AUTHORIZING: {
 365             pa_tagstruct *reply;
 366
 367             if (pa_tagstruct_getu32(t, &c->version) < 0 ||
 368                 !pa_tagstruct_eof(t)) {
 369                 pa_context_fail(c, PA_ERR_PROTOCOL);
 370                 goto finish;
 371             }
 372
 373             /* Minimum supported version */
 374             if (c->version < 8) {
 375                 pa_context_fail(c, PA_ERR_VERSION);
 376                 goto finish;
 377             }
 378
 379             reply = pa_tagstruct_command(c, PA_COMMAND_SET_CLIENT_NAME, &tag);
 380             pa_tagstruct_puts(reply, c->name);
 381             pa_pstream_send_tagstruct(c->pstream, reply);
 382             pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, c, NULL);
 383
 384             pa_context_set_state(c, PA_CONTEXT_SETTING_NAME);
 385             break;
 386         }
 387
 388         case PA_CONTEXT_SETTING_NAME :
 389             pa_context_set_state(c, PA_CONTEXT_READY);
 390             break;
 391
 392         default:
 393             assert(0);
 394     }
 395
 396 finish:
 397     pa_context_unref(c);
 398 }
 399
 400 static void setup_context(pa_context *c, pa_iochannel *io) {
 401     pa_tagstruct *t;
 402     uint32_t tag;
 403
 404     assert(c);
 405     assert(io);
 406
 407     pa_context_ref(c);
 408
 409     assert(!c->pstream);
 410     c->pstream = pa_pstream_new(c->mainloop, io, c->memblock_stat);
 411
 412     pa_pstream_set_die_callback(c->pstream, pstream_die_callback, c);
 413     pa_pstream_set_recieve_packet_callback(c->pstream, pstream_packet_callback, c);
 414     pa_pstream_set_recieve_memblock_callback(c->pstream, pstream_memblock_callback, c);
 415
 416     assert(!c->pdispatch);
 417     c->pdispatch = pa_pdispatch_new(c->mainloop, command_table, PA_COMMAND_MAX);
 418
 419     if (!c->conf->cookie_valid) {
 420         pa_context_fail(c, PA_ERR_AUTHKEY);
 421         goto finish;
 422     }
 423
 424     t = pa_tagstruct_command(c, PA_COMMAND_AUTH, &tag);
 425     pa_tagstruct_putu32(t, PA_PROTOCOL_VERSION);
 426     pa_tagstruct_put_arbitrary(t, c->conf->cookie, sizeof(c->conf->cookie));
 427
 428 #ifdef HAVE_CREDS
 429 {
 430     pa_creds ucred;
 431     gid_t g;
 432
 433     ucred.uid = getuid();
 434     ucred.gid = getgid();
 435
 436     if ((g = pa_get_gid_of_group(c->conf->access_group)) != (gid_t) -1)
 437         if (pa_check_in_group(g) > 0)
 438             ucred.gid = g;
 439
 440     pa_pstream_send_tagstruct_with_creds(c->pstream, t, &ucred);
 441 }
 442 #else
 443     pa_pstream_send_tagstruct_with_creds(c->pstream, t, NULL);
 444 #endif
 445
 446     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, c, NULL);
 447
 448     pa_context_set_state(c, PA_CONTEXT_AUTHORIZING);
 449
 450 finish:
 451
 452     pa_context_unref(c);
 453 }
 454
 455 static void on_connection(pa_socket_client *client, pa_iochannel*io, void *userdata);
 456
 457 #ifndef OS_IS_WIN32
 458
 459 static int context_connect_spawn(pa_context *c) {
 460     pid_t pid;
 461     int status, r;
 462     int fds[2] = { -1, -1} ;
 463     pa_iochannel *io;
 464
 465     pa_context_ref(c);
 466
 467     if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0) {
 468         pa_log(__FILE__": socketpair(): %s", pa_cstrerror(errno));
 469         pa_context_fail(c, PA_ERR_INTERNAL);
 470         goto fail;
 471     }
 472
 473     pa_fd_set_cloexec(fds[0], 1);
 474
 475     pa_socket_low_delay(fds[0]);
 476     pa_socket_low_delay(fds[1]);
 477
 478     if (c->spawn_api.prefork)
 479         c->spawn_api.prefork();
 480
 481     if ((pid = fork()) < 0) {
 482         pa_log(__FILE__": fork(): %s", pa_cstrerror(errno));
 483         pa_context_fail(c, PA_ERR_INTERNAL);
 484
 485         if (c->spawn_api.postfork)
 486             c->spawn_api.postfork();
 487
 488         goto fail;
 489     } else if (!pid) {
 490         /* Child */
 491
 492         char t[128];
 493         const char *state = NULL;
 494 #define MAX_ARGS 64
 495         const char * argv[MAX_ARGS+1];
 496         int n;
 497
 498         /* Not required, since fds[0] has CLOEXEC enabled anyway */
 499         close(fds[0]);
 500
 501         if (c->spawn_api.atfork)
 502             c->spawn_api.atfork();
 503
 504         /* Setup argv */
 505
 506         n = 0;
 507
 508         argv[n++] = c->conf->daemon_binary;
 509         argv[n++] = "--daemonize=yes";
 510
 511         snprintf(t, sizeof(t), "-Lmodule-native-protocol-fd fd=%i", fds[1]);
 512         argv[n++] = strdup(t);
 513
 514         while (n < MAX_ARGS) {
 515             char *a;
 516
 517             if (!(a = pa_split_spaces(c->conf->extra_arguments, &state)))
 518                 break;
 519
 520             argv[n++] = a;
 521         }
 522
 523         argv[n++] = NULL;
 524
 525         execv(argv[0], (char * const *) argv);
 526         _exit(1);
 527 #undef MAX_ARGS
 528     }
 529
 530     /* Parent */
 531
 532     r = waitpid(pid, &status, 0);
 533
 534     if (c->spawn_api.postfork)
 535         c->spawn_api.postfork();
 536
 537     if (r < 0) {
 538         pa_log(__FILE__": waitpid(): %s", pa_cstrerror(errno));
 539         pa_context_fail(c, PA_ERR_INTERNAL);
 540         goto fail;
 541     } else if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 542         pa_context_fail(c, PA_ERR_CONNECTIONREFUSED);
 543         goto fail;
 544     }
 545
 546     close(fds[1]);
 547
 548     c->local = 1;
 549
 550     io = pa_iochannel_new(c->mainloop, fds[0], fds[0]);
 551
 552     setup_context(c, io);
 553     unlock_autospawn_lock_file(c);
 554
 555     pa_context_unref(c);
 556
 557     return 0;
 558
 559 fail:
 560     if (fds[0] != -1)
 561         close(fds[0]);
 562     if (fds[1] != -1)
 563         close(fds[1]);
 564
 565     unlock_autospawn_lock_file(c);
 566
 567     pa_context_unref(c);
 568
 569     return -1;
 570 }
 571
 572 #endif /* OS_IS_WIN32 */
 573
 574 static int try_next_connection(pa_context *c) {
 575     char *u = NULL;
 576     int r = -1;
 577
 578     assert(c);
 579     assert(!c->client);
 580
 581     for (;;) {
 582         pa_xfree(u);
 583         u = NULL;
 584
 585         c->server_list = pa_strlist_pop(c->server_list, &u);
 586
 587         if (!u) {
 588
 589 #ifndef OS_IS_WIN32
 590             if (c->do_autospawn) {
 591                 r = context_connect_spawn(c);
 592                 goto finish;
 593             }
 594 #endif
 595
 596             pa_context_fail(c, PA_ERR_CONNECTIONREFUSED);
 597             goto finish;
 598         }
 599
 600         pa_log_debug(__FILE__": Trying to connect to %s...", u);
 601
 602         pa_xfree(c->server);
 603         c->server = pa_xstrdup(u);
 604
 605         if (!(c->client = pa_socket_client_new_string(c->mainloop, u, PA_NATIVE_DEFAULT_PORT)))
 606             continue;
 607
 608         c->local = pa_socket_client_is_local(c->client);
 609         pa_socket_client_set_callback(c->client, on_connection, c);
 610         break;
 611     }
 612
 613     r = 0;
 614
 615 finish:
 616     pa_xfree(u);
 617
 618     return r;
 619 }
 620
 621 static void on_connection(pa_socket_client *client, pa_iochannel*io, void *userdata) {
 622     pa_context *c = userdata;
 623
 624     assert(client);
 625     assert(c);
 626     assert(c->state == PA_CONTEXT_CONNECTING);
 627
 628     pa_context_ref(c);
 629
 630     pa_socket_client_unref(client);
 631     c->client = NULL;
 632
 633     if (!io) {
 634         /* Try the item in the list */
 635         if (errno == ECONNREFUSED || errno == ETIMEDOUT || errno == EHOSTUNREACH) {
 636             try_next_connection(c);
 637             goto finish;
 638         }
 639
 640         pa_context_fail(c, PA_ERR_CONNECTIONREFUSED);
 641         goto finish;
 642     }
 643
 644     unlock_autospawn_lock_file(c);
 645     setup_context(c, io);
 646
 647 finish:
 648     pa_context_unref(c);
 649 }
 650
 651 int pa_context_connect(
 652         pa_context *c,
 653         const char *server,
 654         pa_context_flags_t flags,
 655         const pa_spawn_api *api) {
 656
 657     int r = -1;
 658
 659     assert(c);
 660     assert(c->ref >= 1);
 661
 662     PA_CHECK_VALIDITY(c, c->state == PA_CONTEXT_UNCONNECTED, PA_ERR_BADSTATE);
 663     PA_CHECK_VALIDITY(c, !(flags & ~PA_CONTEXT_NOAUTOSPAWN), PA_ERR_INVALID);
 664     PA_CHECK_VALIDITY(c, !server || *server, PA_ERR_INVALID);
 665
 666     if (!server)
 667         server = c->conf->default_server;
 668
 669     pa_context_ref(c);
 670
 671     assert(!c->server_list);
 672
 673     if (server) {
 674         if (!(c->server_list = pa_strlist_parse(server))) {
 675             pa_context_fail(c, PA_ERR_INVALIDSERVER);
 676             goto finish;
 677         }
 678     } else {
 679         char *d;
 680         char ufn[PATH_MAX];
 681
 682         /* Prepend in reverse order */
 683
 684         if ((d = getenv("DISPLAY"))) {
 685             char *e;
 686             d = pa_xstrdup(d);
 687             if ((e = strchr(d, ':')))
 688                 *e = 0;
 689
 690             if (*d)
 691                 c->server_list = pa_strlist_prepend(c->server_list, d);
 692
 693             pa_xfree(d);
 694         }
 695
 696         c->server_list = pa_strlist_prepend(c->server_list, "tcp6:localhost");
 697         c->server_list = pa_strlist_prepend(c->server_list, "tcp4:localhost");
 698
 699         /* The system wide instance */
 700         c->server_list = pa_strlist_prepend(c->server_list, PA_SYSTEM_RUNTIME_PATH "/" PA_NATIVE_DEFAULT_UNIX_SOCKET);
 701
 702         /* The per-user instance */
 703         c->server_list = pa_strlist_prepend(c->server_list, pa_runtime_path(PA_NATIVE_DEFAULT_UNIX_SOCKET, ufn, sizeof(ufn)));
 704
 705         /* Wrap the connection attempts in a single transaction for sane autospawn locking */
 706         if (!(flags & PA_CONTEXT_NOAUTOSPAWN) && c->conf->autospawn) {
 707             char lf[PATH_MAX];
 708
 709             pa_runtime_path(AUTOSPAWN_LOCK, lf, sizeof(lf));
 710             pa_make_secure_parent_dir(lf, 0700, (uid_t)-1, (gid_t)-1);
 711             assert(c->autospawn_lock_fd <= 0);
 712             c->autospawn_lock_fd = pa_lock_lockfile(lf);
 713
 714             if (api)
 715                 c->spawn_api = *api;
 716             c->do_autospawn = 1;
 717         }
 718
 719     }
 720
 721     pa_context_set_state(c, PA_CONTEXT_CONNECTING);
 722     r = try_next_connection(c);
 723
 724 finish:
 725     pa_context_unref(c);
 726
 727     return r;
 728 }
 729
 730 void pa_context_disconnect(pa_context *c) {
 731     assert(c);
 732     assert(c->ref >= 1);
 733
 734     pa_context_set_state(c, PA_CONTEXT_TERMINATED);
 735 }
 736
 737 pa_context_state_t pa_context_get_state(pa_context *c) {
 738     assert(c);
 739     assert(c->ref >= 1);
 740
 741     return c->state;
 742 }
 743
 744 int pa_context_errno(pa_context *c) {
 745     assert(c);
 746     assert(c->ref >= 1);
 747
 748     return c->error;
 749 }
 750
 751 void pa_context_set_state_callback(pa_context *c, pa_context_notify_cb_t cb, void *userdata) {
 752     assert(c);
 753     assert(c->ref >= 1);
 754
 755     c->state_callback = cb;
 756     c->state_userdata = userdata;
 757 }
 758
 759 int pa_context_is_pending(pa_context *c) {
 760     assert(c);
 761     assert(c->ref >= 1);
 762
 763     PA_CHECK_VALIDITY(c,
 764                       c->state == PA_CONTEXT_CONNECTING ||
 765                       c->state == PA_CONTEXT_AUTHORIZING ||
 766                       c->state == PA_CONTEXT_SETTING_NAME ||
 767                       c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 768
 769     return (c->pstream && pa_pstream_is_pending(c->pstream)) ||
 770         (c->pdispatch && pa_pdispatch_is_pending(c->pdispatch)) ||
 771         c->client;
 772 }
 773
 774 static void set_dispatch_callbacks(pa_operation *o);
 775
 776 static void pdispatch_drain_callback(PA_GCC_UNUSED pa_pdispatch*pd, void *userdata) {
 777     set_dispatch_callbacks(userdata);
 778 }
 779
 780 static void pstream_drain_callback(PA_GCC_UNUSED pa_pstream *s, void *userdata) {
 781     set_dispatch_callbacks(userdata);
 782 }
 783
 784 static void set_dispatch_callbacks(pa_operation *o) {
 785     int done = 1;
 786
 787     assert(o);
 788     assert(o->ref >= 1);
 789     assert(o->context);
 790     assert(o->context->ref >= 1);
 791     assert(o->context->state == PA_CONTEXT_READY);
 792
 793     pa_pstream_set_drain_callback(o->context->pstream, NULL, NULL);
 794     pa_pdispatch_set_drain_callback(o->context->pdispatch, NULL, NULL);
 795
 796     if (pa_pdispatch_is_pending(o->context->pdispatch)) {
 797         pa_pdispatch_set_drain_callback(o->context->pdispatch, pdispatch_drain_callback, o);
 798         done = 0;
 799     }
 800
 801     if (pa_pstream_is_pending(o->context->pstream)) {
 802         pa_pstream_set_drain_callback(o->context->pstream, pstream_drain_callback, o);
 803         done = 0;
 804     }
 805
 806     if (done) {
 807         if (o->callback) {
 808             pa_context_notify_cb_t cb = (pa_context_notify_cb_t) o->callback;
 809             cb(o->context, o->userdata);
 810         }
 811
 812         pa_operation_done(o);
 813         pa_operation_unref(o);
 814     }
 815 }
 816
 817 pa_operation* pa_context_drain(pa_context *c, pa_context_notify_cb_t cb, void *userdata) {
 818     pa_operation *o;
 819
 820     assert(c);
 821     assert(c->ref >= 1);
 822
 823     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 824     PA_CHECK_VALIDITY_RETURN_NULL(c, pa_context_is_pending(c), PA_ERR_BADSTATE);
 825
 826     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 827     set_dispatch_callbacks(pa_operation_ref(o));
 828
 829     return o;
 830 }
 831
 832 void pa_context_simple_ack_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
 833     pa_operation *o = userdata;
 834     int success = 1;
 835
 836     assert(pd);
 837     assert(o);
 838     assert(o->ref >= 1);
 839
 840     if (!o->context)
 841         goto finish;
 842
 843     if (command != PA_COMMAND_REPLY) {
 844         if (pa_context_handle_error(o->context, command, t) < 0)
 845             goto finish;
 846
 847         success = 0;
 848     } else if (!pa_tagstruct_eof(t)) {
 849         pa_context_fail(o->context, PA_ERR_PROTOCOL);
 850         goto finish;
 851     }
 852
 853     if (o->callback) {
 854         pa_context_success_cb_t cb = (pa_context_success_cb_t) o->callback;
 855         cb(o->context, success, o->userdata);
 856     }
 857
 858 finish:
 859     pa_operation_done(o);
 860     pa_operation_unref(o);
 861 }
 862
 863 pa_operation* pa_context_exit_daemon(pa_context *c, pa_context_success_cb_t cb, void *userdata) {
 864     pa_tagstruct *t;
 865     pa_operation *o;
 866     uint32_t tag;
 867
 868     assert(c);
 869     assert(c->ref >= 1);
 870
 871     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 872
 873     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 874
 875     t = pa_tagstruct_command(c, PA_COMMAND_EXIT, &tag);
 876     pa_pstream_send_tagstruct(c->pstream, t);
 877     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
 878
 879     return o;
 880 }
 881
 882 pa_operation* pa_context_send_simple_command(pa_context *c, uint32_t command, pa_pdispatch_cb_t internal_cb, pa_operation_cb_t cb, void *userdata) {
 883     pa_tagstruct *t;
 884     pa_operation *o;
 885     uint32_t tag;
 886
 887     assert(c);
 888     assert(c->ref >= 1);
 889
 890     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 891
 892     o = pa_operation_new(c, NULL, cb, userdata);
 893
 894     t = pa_tagstruct_command(c, command, &tag);
 895     pa_pstream_send_tagstruct(c->pstream, t);
 896     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, internal_cb, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
 897
 898     return o;
 899 }
 900
 901 pa_operation* pa_context_set_default_sink(pa_context *c, const char *name, pa_context_success_cb_t cb, void *userdata) {
 902     pa_tagstruct *t;
 903     pa_operation *o;
 904     uint32_t tag;
 905
 906     assert(c);
 907     assert(c->ref >= 1);
 908
 909     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 910
 911     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 912
 913     t = pa_tagstruct_command(c, PA_COMMAND_SET_DEFAULT_SINK, &tag);
 914     pa_tagstruct_puts(t, name);
 915     pa_pstream_send_tagstruct(c->pstream, t);
 916     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT,  pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
 917
 918     return o;
 919 }
 920
 921 pa_operation* pa_context_set_default_source(pa_context *c, const char *name, pa_context_success_cb_t cb, void *userdata) {
 922     pa_tagstruct *t;
 923     pa_operation *o;
 924     uint32_t tag;
 925
 926     assert(c);
 927     assert(c->ref >= 1);
 928
 929     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 930
 931     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 932
 933     t = pa_tagstruct_command(c, PA_COMMAND_SET_DEFAULT_SOURCE, &tag);
 934     pa_tagstruct_puts(t, name);
 935     pa_pstream_send_tagstruct(c->pstream, t);
 936     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT,  pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
 937
 938     return o;
 939 }
 940
 941 int pa_context_is_local(pa_context *c) {
 942     assert(c);
 943
 944     return c->local;
 945 }
 946
 947 pa_operation* pa_context_set_name(pa_context *c, const char *name, pa_context_success_cb_t cb, void *userdata) {
 948     pa_tagstruct *t;
 949     pa_operation *o;
 950     uint32_t tag;
 951
 952     assert(c);
 953     assert(c->ref >= 1);
 954     assert(name);
 955
 956     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 957
 958     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 959
 960     t = pa_tagstruct_command(c, PA_COMMAND_SET_CLIENT_NAME, &tag);
 961     pa_tagstruct_puts(t, name);
 962     pa_pstream_send_tagstruct(c->pstream, t);
 963     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT,  pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
 964
 965     return o;
 966 }
 967
 968 const char* pa_get_library_version(void) {
 969     return PACKAGE_VERSION;
 970 }
 971
 972 const char* pa_context_get_server(pa_context *c) {
 973     assert(c);
 974     assert(c->ref >= 1);
 975
 976     if (!c->server)
 977         return NULL;
 978
 979     if (*c->server == '{') {
 980         char *e = strchr(c->server+1, '}');
 981         return e ? e+1 : c->server;
 982     }
 983
 984     return c->server;
 985 }
 986
 987 uint32_t pa_context_get_protocol_version(PA_GCC_UNUSED pa_context *c) {
 988     return PA_PROTOCOL_VERSION;
 989 }
 990
 991 uint32_t pa_context_get_server_protocol_version(pa_context *c) {
 992     assert(c);
 993     assert(c->ref >= 1);
 994
 995     return c->version;
 996 }
 997
 998 pa_tagstruct *pa_tagstruct_command(pa_context *c, uint32_t command, uint32_t *tag) {
 999     pa_tagstruct *t;
1000
1001     assert(c);
1002     assert(tag);
1003
1004     t = pa_tagstruct_new(NULL, 0);
1005     pa_tagstruct_putu32(t, command);
1006     pa_tagstruct_putu32(t, *tag = c->ctag++);
1007
1008     return t;
1009 }